Water heater and steam generator



Jan. 24, 1928.

F. W. ELLYSON WATER HEATER AND STEAM GENERATOR Filed April 25, 1922Patented Jan. 24, 1928.

1,657,202 PATENT OFFICE.

FREDERICK WASHINGTON ELLYSON, OF MUNICH, GERMANY.

WATER HEATER AND STEAM GENERATOR.

Application led April 25, 1922 Serial No. 556,521.

There are known steam generators and water heaters in which, incontradistinction to the boilers with large water space or to smoke-tubeboilers, the evaporation is accelerated, and restricted to a relativelysmall space, by conducting the water which is cir- Culated by a pump ora head through narrow, more or less spirally-shaped passages of circularor oval transverse section, which are heated from their outer side andat one end of which either hot water or steam is discharged, accordingto the length of the 'passage and to the temperature of the heatingmedium.

The steam generators and hot-water producers constructed and yoperatingaccording to that principle are subject, to the drawback that the narrowtubes get easily clogged and can no morelbe cleaned, especially if theclogging is due to incrustation, to oil-soaps resulting from condensedsteam or the like.

The present invention relates to a water heater and steam generatorbased on the above-mentioned principle, but distinguished from the knownconstructions by the feature that the sectional area of the spirallyshaped passage in which the water is exposed to the heatof the heatinggases is reduced from below to abovel so that the water, in flowingthrough this passage, is

heated with increasing rapidity and is, finally, evaporated, the steambeing,lultimately, superheated, provided, there be sufficient heatavailable for this purpose. This may be regulated as required 1n thevarious cases.

In order to make my invention more clear, I refer to the accompanyingdrawing, in which similar numbers of reference denoteY similar partsthroughout the several views, and l in which Fig. 1 is an axial sectionthrough the threaded inner tube-like body of a constructional example ofa steam generator and water heater constructed according to thisinvention, the left hand half of the ligure showing in dotted lines thebody or tube in its original cylindrical state, the other half showingthe-body or tube after it has been turned in such a manner as to form ahollow truncated'cone. Fig. 2 is an axial section through the finishedsteam generating or water heater double-body.

1 (left hand half of Fig. 1) is a cylindrical hollow body consistingpreferably of pressedcast iron or the like and having a rolled or milledor cut thread, of which A-B' is the outer boundary line. The

thread is turned oi in a measure increasing from the one end of thecylinder 1 to thev other end, namely corresponding to the line C--D(right hand half of Fig. l) so that a hollow truncated cone results. Acorrespondingly shaped tapering tube 2 (Fig. 2) is shoved upon thethreaded truncated cone 1 and is firmly connected with it by means offlanges 5 and bolts (not shown). The tube 2 has branches 3 and 4forconnecting it, or the passage or passages of the body 1 respectively,with asupply tube and a discharge tube. I

Tightening or packing the single convolutions of the helical passagewith respect to each other is not necessary because the differences ofpressure and of temperature are very small. Even if there should be aslight direct axial communication between two convolutions, or, may be aplurality of such communications or leaks that would be of noconsequence partly on account of the throttling at the respective placeor places, partly on account of the fact that practically all waterparticles are borne along with the current which circulates more or lessquickly through the helical passage which the thread forms.

I claim- 1. A water heater and steam generator, comprising, incombination, a thick-walled vertical tube having a helical groove, thesectional area of which is reduc-ed progressively from inlet to outlet,and a shell shoved over said groove.

2. A water heater and steam generator,

comprising, in combination, a thick-walled vertical tube tapering inupward direction and having in its outer surfacea h elical groove, thesectional area of which 1s reduced in upward direction from a lower'1nlet to an upper outlet, and a shell fittmg said oove.

3. water heater and steam generator, comprising, in combination, athick-walled vertical tube tapering in upward direction and having inits outer surface a helical groove of uniform inside diameter, thesectional area of which is thus reduced 1n upward direction from a lowerinlet to an upper outlet, and a shell fitting the outside of the tube toclose said groove.

In` testimony whereof I affix my signature.

